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首页> 外文期刊>Separation and Purification Technology >Multilayer composite SBS membranes for pervaporation and gas separation
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Multilayer composite SBS membranes for pervaporation and gas separation

机译：用于渗透气和气体分离的多层复合SBS膜

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Composite membranes based on poly(styrene-b-butadiene-b-styrene), triblock copolymer (SBS) with 28 wt.% of styrene, were prepared by coating porous hollow fibers and flat sheet supports. The membrane preparation was optimized by modulating different experimental parameters, such as support type, SBS concentration, solvent type, coating thickness, support pre-treatment. On a laboratory scale both normal and vacuum assisted dip-coating methods were used for the hollow fiber geometry, while dope casting was adopted for flat sheet membranes. Single gas permeation measurements were carried out to determine the effective thickness of the coating layer and its integrity. This characterization, coupled with morphological analysis, allowed the optimization of the coating procedure. Appropriate coating conditions yield dense films with a good contact of the coating layer to the support. At sufficiently elevated SBS concentration, the high solution viscosity avoided the polymer infiltration into the support pores. The thickness of the SBS films, ranging from few microns to some tens of microns, meets the requirement for application in pervaporation. Therefore, pilot scale spiral-wound modules of SBS on poly(vinylidene-fluoride-co-tetrafluoroethylene) (Fluoroplast-42 or F-42) supports for potential use in gas separation and pervaporation (e.g. for ethanol/water separation) were manufactured. An intermediate silicone or poly (ether urethane urea) (PU) layer reduced the infiltration of the polymer solution, improving the adhesion between the selective and support layers and modulating the transport properties. Permeation tests evidenced a clear role of the intermediate layer in the gas transport, with highly enhanced gas selectivity in case of the PU intermediate layer.
机译：通过涂覆多孔中空纤维和平板载体，制备基于聚（苯乙烯-b-丁二烯-b-苯乙烯）的三嵌段共聚物（SBS）和28wt。％的苯乙烯的复合膜。通过调节不同的实验参数（例如载体类型，SBS浓度，溶剂类型，涂层厚度，载体预处理）来优化膜的制备。在实验室规模中，中空纤维的几何形状均采用常规和真空辅助浸涂方法，而平板膜则采用浓液流延法。进行一次气体渗透测量以确定涂层的有效厚度及其完整性。这种表征与形态分析相结合，可以优化涂层工艺。适当的涂布条件可产生致密的薄膜，并使涂层与载体形成良好的接触。在充分提高的SBS浓度下，高溶液粘度避免了聚合物渗透到支撑孔中。 SBS薄膜的厚度从几微米到几十微米不等，可以满足全蒸发应用的要求。因此，制造了在聚（偏二氟乙烯-共四氟乙烯）（Fluoroplast-42或F-42）载体上的SBS中试规模的螺旋缠绕组件，其潜在地用于气体分离和全蒸发（例如，用于乙醇/水分离）。中间有机硅或聚（醚氨基甲酸酯尿素）（PU）层减少了聚合物溶液的渗透，提高了选择性层和支撑层之间的附着力，并调节了传输性能。渗透测试证明了中间层在气体传输中的明显作用，在PU中间层的情况下，气体选择性大大提高。

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